A free-flowing food grade sodium nitrite and production method thereof

Abstract

A free-flowing food grade sodium nitrite and production method thereof. The free flowing food grade sodium nitrite including sodium nitrate (SNI) having purity of 99.0-99.9%, wherein NaNO3 is no greater than 0.70%, wherein alkalinity as Na2CO3 is no greater than 600 ppm, wherein a chloride content is no greater than about 50 ppm, wherein a sulphate content is no greater than 50 ppm, wherein loss on drying is no greater than 0.2%, wherein a content of insoluble is no greater than 0.4%, wherein a content of a heavy metal is no greater than 10 ppm wherein a content of assay is within a range of 98.5% to 100.5%.

1 . A form of a free-flowing food grade sodium nitrite comprising:
 sodium nitrate (SNI) having purity of 99.0-99.9%, wherein NaNO3 is no greater than 0.70%, wherein alkalinity as Na2CO3 is no greater than 600 ppm, wherein a chloride content is no greater than about 50 ppm, wherein a sulphate content is no greater than 50 ppm, wherein loss on drying is no greater than 0.2%, wherein a content of insoluble is no greater than 0.4%, wherein a content of a heavy metal is no greater than 10 ppm, wherein a content of assay is within a range of 98.5% to 100.5%.   
     
     
         2 . The form of free-flowing food grade sodium nitrate as claimed in  claim 1 , wherein the heavy metal is at least Lead (pb). 
     
     
         3 . The form of the free-flowing food grade sodium nitrite as claimed in  claim 1 , comprising a content of Arsenic (As) is no greater than 0.2 ppm, wherein a content of Cadmium (cd) is no greater than 1 ppm, wherein a content of Lead (pb) is no greater than 1 ppm, wherein a content of Mercury (Hg) is no greater than 0.05 ppm. 
     
     
         4 . A method of obtaining a free-flowing food grade sodium nitrite, wherein the method comprising steps of:
 charging a predefined amount of water in a reactor;   adding dry powder of sodium nitrite (SNI) having predefined purity in the reactor under stiffing conditions to obtain SNI liquor of mass sodium nitrite;   heating the SNI liquor of mass sodium nitrite at 40-60° C. under stirring to completely dissolve the dry powder and transfer to evaporator feed tank through filters;   feeding the SNI liquor of mass sodium nitrite in the evaporator to concentrate liquor to obtain slurry mass of SNI having 30 to 40% free salt concentration;   filtering the slurry mass of SNI through centrifuge at a temperature within a range of 50° C.-65° C. to separate wet cake and mother liquor (ML), wherein the ML goes back to an external SNI liquor;   drying the wet cake using a drying unit at a temperature within a range of 100° C.-140° C. continuously with cold zone operating at 25-60° C. to obtain dry SNI material; and   coating the dry SNI material with a food grade additive in a blender to obtain free-flowing food grade sodium nitrite.   
     
     
         5 . The method as claimed in  claim 4 , wherein the predefined purity of the sodium nitrite is 99.0%-99.9%. 
     
     
         6 . The method as claimed in  claim 4 , wherein the SNI liquor of mass sodium nitrite is transferred to feed tank through filters in order to avoid foreign materials including black particles and other particulates to tune of 1-4 micron. 
     
     
         7 . The method as claimed in  claim 4 , wherein the wet cake is having moisture content 1-12%. 
     
     
         8 . The method as claimed in  claim 4 , wherein the wet cake material is dried using Vibratory Fluidized Bed Dryer (VFBD). 
     
     
         9 . The method as claimed in  claim 4 , wherein the food grade additive is silica. 
     
     
         10 . The method as claimed in  claim 4 , wherein the free-flowing food grade sodium nitrite is packed in bags. 
     
     
         11 . The method as claimed in  claim 4 , wherein the free-flowing food grade Sodium nitrite is analyzed in view of food grade SNI specification.